/Engine/Source/Runtime/Experimental/Chaos/Public/GeometryCollection/Facades/CollectionTransformSelectionFacade.h
Replace any Embedded or Rigid transforms in InOutSelection with their parent cluster. If there is just a rigid root node selected, optionally keep it if bLeaveRigidRoot is true.
void ConvertSelectionToClusterNodes ( [TArray](API\Runtime\Core\Containers\TArray)< int32 > & InOutSelection, bool bLeaveRigidRoots ) const